diff --git a/extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php b/extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php
new file mode 100644
index 000000000..a837fdddf
--- /dev/null
+++ b/extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('discussions', function (Blueprint $table) {
+            $table->index(['is_sticky', 'last_posted_at']);
+        });
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('discussions', function (Blueprint $table) {
+            $table->dropIndex(['is_sticky', 'last_posted_at']);
+        });
+    }
+];